Coursework.Info - Inspiration in an Instant

On the left is an image preview of every page of this document, and below are the first 150 words with formatting removed:

SIGNAL DETECTION THEORY (thery +criterion) The theory of signal detection theory evolved from the development of communications and radar equipment in the first half of this century. It migrated to psychology, initially as part of sensation and perception, in the 50's and 60's as an attempt to understand some of the features of human behavior when detecting very faint stimuli that were not being explained by traditional theories of thresholds. According to the theory, of absolute threshold a minimum stimulus energy is necessary for an observer to detect a stimulus.i.e. If there is a stimulus present we perceive the stimulus even if the intensity of the stimulus is minimum. But, these theories give importance to an observer's sensory capacities. The probability that an observer detects the stimulus is not given importance. The signal detection theory is different from traditional threshold theories. It says that the subject makes a decision, a cognitive...

To see the full version of this document, and 144,904 others